Categories: Environmental, Landscape
The Seattle Public Works required a lightweight soil that must perform like a premium turf grass rootzone but at only a fraction of the weight to be laid on the concrete cap of their 16 acre reservoir project.
Project Details – Maple Leaf Reservoir Capping

Seattle Public Utilities
Landscape Architect
MWH Global
Seattle, Washington
Veratec Products & Services Required
Custom Lightweight Media
Soil Testing



  • A massive 8 acre planted roof area covers this 60 million gallon drinking water reservoir
  • Total of 15,600 cubic yards of custom engineered lightweight growing media was required to ‘cap’ the concrete reservoir roof deck
  • The Custom Engineered lightweight media performs similar to a USGA golf green rootzone, but at only 50-55% of the loose bulk density.